It was then, he said, that he had decided to make a clean breast of matters.

就在那一刻，他就决定坦白自己的罪行。

youdao

If he did know, then he did indeed lie on the Today Programme and wont make a clean breast of it.

BBC: [an error occurred while processing this directive]

In theory, it would be marvellous if errant Italian politicians or public figures were able to make a clean breast of past sins and promise to turn over a collective new leaf as part of a general clean-up.

ECONOMIST: Italy: Unseemly, unending | The